A study cited by NDTV reports that exposure to E20 petrol can cause damage in certain components of older vehicles, potentially requiring replacement. The report says the effects include increased hardening, loss of strength and flexibility, and swelling in some parts. NDTV notes that these changes are observed in older models, including vehicles meeting BS-III standards. The coverage frames the findings as part of an assessment of how higher ethanol fuel blends interact with older material and component designs. While the outlet does not provide specific mileage thresholds, timelines, or a complete list of affected parts in the provided text, it links the degradation to E20 exposure rather than normal fuel use. Overall, the story centers on the study’s conclusion that some components used in older vehicles may not tolerate E20 as well as they do lower-blend fuels, and that operators may need to inspect and replace certain parts depending on vehicle type and condition.